S-91853A031 3/8"-16 Locknuts

Key Features & Benefits at a Glance

• Vibration-proof locking mechanism with cotter pin design prevents loosening under extreme conditions, ensuring long-term joint integrity
• Superior corrosion resistance from 18-8 stainless steel construction maintains performance in harsh industrial environments
• Precision Class 2B thread fit guarantees smooth installation and reliable engagement with mating components
• Standard external hex drive enables easy installation with common tools while accommodating 3/32" cotter pins for positive locking
• Robust dimensional specifications including 9/16" width and 13/32" height provide consistent performance across applications
• Environmental compliance assurance with RoHS 3 and REACH SVHC regulations meets international manufacturing standards
• Optimized slot dimensions (0.13" min depth, 0.12" min width) ensure secure cotter pin retention without compromising structural integrity

Professional Applications & Engineering Value

This 3/8"-16 UNC stainless steel locknut delivers critical safety performance in high-vibration applications where fastener failure is not an option. The cotter pin locking mechanism provides mechanical security that surpasses friction-based alternatives, making it ideal for heavy machinery, agricultural equipment, and transportation systems. Engineered with 18-8 stainless steel, the nut maintains corrosion resistance while the coarse thread profile enables rapid assembly in field maintenance scenarios. The external hex drive accommodates standard wrenches for straightforward installation, while the Class 2B thread fit ensures consistent torque values without galling. This combination of positive locking and material durability addresses the primary challenge of maintaining preload in dynamic loading conditions.

Specification Summary & Compliance

Manufactured to precise dimensional standards including 3/8"-16 UNC coarse threads with Class 2B thread fit for optimal engagement. The nut features a standard hex profile measuring 9/16" across flats with 13/32" height, designed to accommodate 3/32" diameter cotter pins through slots with minimum 0.13" depth and 0.12" width. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility while meeting industrial fastener specifications for critical applications.